Slashing mechanism for rib applying machines



Ap i 1955 A. R. RIDDERSTROM SLASHING MECHANISM FOR RIB APPLYING MACHINESFiled March 18, 1952 IN V EN TOR.

United States Patent M SLASHING MECHANISM FOR RIB APPLYING MACHINESAndrew R. Ridderstrom, Nahant, Mass., assignor to Prime ManufacturingCompany, Lynn, Mass., a corporation of Massachusetts Application March18, 1952, Serial No. 277,153

Claims. (Cl. 12-20) This invention comprises a new and improved slashingor pinking mechanism for rib applying machmes such as .those employedfor adhesively attaching a sewing rib to a fiat insole blank.

In applying to an insole blank a sewing rib that is secured by anadhesive tape, it has been found that the tape has a tendency to curl upor away from the underlying surface of the insole. This tendency is sostrong about the convex curvature of the toe that in the case oflaminated insoles the laminations may be actually separated from eachother by the pull of the tape thus introducing a serious defect into theshoemaking process.

The object of the present invention is to correct this situation and toprovide an improved slashing or pinking knife that will be effective asstripping is laid to interrupt the continuity of the tape, thuseliminating tension in its convex margin and insuring a stable flatcondition.

The salient feature of the invention is a slashing knife located in thefeed foot of a rib applying machine in such a manner that as theadhesive tape portion of the composite rib is progressively pressed uponthe insole blank, its margin will be slashed and there will be noinitial tension tending to disturb the fiat position of the tape.

Preferably and as herein shown, the body of the feed foot has asubstantially flat work-engaging surface intersected by a rib-receivinggroove, and the slashing knife is mounted in the body portion of thefoot with its cutting edge projecting beyond its work-engaging face andlocated wholly on one side of the rib-receiving groove.

In a preferred form of the invention the foot is provided with acircular passage opening downwardly through its work-engaging face and acylindrical knife is located in this passage and backed up by anadjusting screw located tangentially behind the inner end of the knife.This construction is advantageously compact. It affords a convenient,accurate and secure means of adjusting and holding the knife as well asconvenient provision for removal of the knife for sharpening orreplacement.

These and other features of the invention will be best understood andappreciated from the following description of a preferred embodimentthereof, selected for purposes of illustration and shown in theaccompanying drawings in which:

Fig. 1 is a view in elevation showing so much of the rib-applyingmachine as is necessary to understand the slashing knife mechanism,

Fig. 2 is a fragmentary view on an enlarged scale showing the slashedribbing as applied to the portion of an insole,

Figs. 3 and 5 are views in elevation of the presser foot as seen fromopposite sides,

Fig. 4 is a view of the presser foot in end elevation showing itsrelation to the insole, and

Fig. 6 is a fragmentary view showing the path of move ment of thepresser foot.

In Fig. 2 is illustrated one example of the work performed by theslashing mechanism of this invention. In this instance a sewing rib isapplied to a fiat insole 10. The rib comprises an upright core 11 whichis enclosed in an adhesive tape 12. The tape is turned laterally in bothdirections from the core and presents an outturned portion which liesflush with the marginal edge of the sole 10 and a somewhat widerinturned portion whlch lies on the inner side of the core 11. The tapeis adhesively coated and adheres to the core 11 and to the surface 10 ofthe insole which has been previously coated with cement. In rounding thetoe portion of the insole 2,706,824 Patented Apr. 26, 1955 pleats 13 areformed in the inturned portion of the adhesive tape and slashes 14 areformed at regular intervale in its outturned portion. These are formedby the mechanism of the present invention which will now be described.

In Fig. 1 sufiicient of the machine of my prior Patent No. 2,142,332 isshown for a complete understanding of the present invention. In theframe 16 is journaled a freely rotatable work-supporting roll 17 and apair of driven shafts 18 and 19 on both of which is formed a pair ofeccentrics arranged to operate arms 20 and 21 carrying the feed feet.The eccentrics are so timed as to move the arms alternately in a tapefeeding and pressing path of the character shown in dotted lines in Fig.6. and so impart longitudinal feeding movement to the sole and tapebeneath them.

A guide foot 22 for the composite stripping is adjustably fastened to abracket member 23 pivotally mounted to rock about a pivot 24 andcontrolled in its position through a' link 25 connected to a rockermember 26 pivotally mounted upon a shaft 27 in the machine frame andoperated through a treadle lever 28. Cut-off mechanism 29 is arranged toswing bodily about the shaft 24 and is brought into operative orinoperative position alternatively with the guide foot 22 under thecontrol of the treadle rod 28. The parts of the machine thus fardescribed form no part of the present invention.

The arm 21 carries the feed foot 30 illustrated in Figs. 3-5. The bodyof the feed foot has a substantially flat lower work-engaging face whichis intersected by a rib-receiving groove 31 that longitudinally dividesthe work-engaging foot into an inner portion 32 and an outer knurledportion 33. The insole and ribbing material are presented to the feedfeet upon the roll 17 in such a manner that the inner portion 32 of thefeed foot engages the inturned portion of the adhesive tape 12 while theouter portion 33 of the feed foot engages that portion of the tape whichlies outside the rib and is laid substantially flush with the outerperiphery of the insole 10. The upstanding rib passes freely through thelongitudinal groove 31. The arm 20 carries a feed foot which may besimilar in shape to the feed foot 30, and it will be understood thatthese two feet are operated alternately so that one 1s in feedingengagement with the work while the other is being lifted and returned bythe path shown in Fig. 6 to engagement with the work.

The outer portion of the feed foot 30 is herein shown as provided with acircular or cylindrical slot 34 opening at its forward end through theknurled work-engaging face of the outer portion 33 of the feed foot andat its rear end through the body of the foot which is shouldered orstepped as shown in Figs. 3 and 5. The slot 34 is about in length andopens continuously and laterally through the outer face of the portion33 of the feed foot.

The slashing knife 35 which has the shape of a cylindrical segmentfitting the groove 34 is received within that groove and is backed up atits rear end by an abutment screw 36 that is threaded into the body ofthe foot, tangentially disposed with respect to the knife and arrangedto be held in position by a lock nut. The knife 35 is set by ad ustmentof this screw so that its sharpened blade protrudes downwardly beyondthe knurled workengagmg face of the feed foot and at right angles to ther1b-receiv1ng groove 31. As shown in Fig. 4, its straight sharpened edgeis inclined at an angle of approximately 5 to the horizontal to impart ashearing effect to its cutting action. The knife 35 is retained in thecircular slot 34 by the head of a retaining screw 37 which is threadedinto the side wall of the foot.

It Will be understood that the slashing knife 35 is set in the foot sothat each time the foot engages and presses the tape laid outside therib, the knife will form one of the slashed cuts 14 shown in Fig. 2. Thedepth of the cut is regulated by the distance by which the knife edgeprotrudes beyond the knurled face of the outer portion 33 of the feedfoot. The optimum adjustment is that in which the edge of the knifeslashes completely through the adhesive tape but does not enter thematerial of the insole 10 and, as already explained, the effect of theslashes is to eliminate deforming tension from the slashed portion ofthe tape so that it will lie naturally in stable fiat condition.

Having thus disclosed my invention and described in detail a preferredembodiment thereof, I claim as new and desire to secure by LettersPatent:

1. A feed foot for imparting longitudinal feeding movement to a sole ina rib-applying machine, comprising a body portion having a substantiallyfiat work-engaging face intersected by a rib-receiving groove, and acylindrical slashing knife mounted in the said body portion and having astraight cutting edge projecting beyond the workengaging face of thefeed foot, located wholly on one side of the ribreceiving groove anddisposed at substantially right angles thereto.

2. In a rib-applying machine, a feed foot for imparting longitudinalfeeding movement to a sole and having two portions separated by alongitudinal rib-receiving groove, one of said portions having a curvedpassage therein, a curved knife adjustably contained in said passage andhaving a straight protruding cutting edge disposed at substantiallyright angles to said groove, an abutment screw in the feed foot engagingthe rear unsharpened edge of the curved knife, and means for retainingthe knife against lateral displacement in its passage.

3. In a rib-applying machine, a pair of feed feet operating alternatelyto impart longitudinal feeding movement to a sole, means for operatingthem alternately to engage and advance simultaneously an insole and asewing rib strip including an adhesive tape, one of said feet having alongitudinally grooved work-engaging face, and a cylindrical slashingknife adjustably mounted in said foot in that portion thereof whichengages the adhesive tape laid about the convex toe end of the insoleand having a straight cutting edge disposed at substantially rightangles to the groove of the feed foot.

4. In a rib-applying machine, a feed foot having a grooved work-engagingface, a cylindrical passage in the foot at least in length and openingdownwardly through the work-engaging face thereof, a cylindrical knifelocated in said passage and having a straight transversely inclinedcutting edge protruding from the passage, and an adjusting screw locatedtangentially behind the inner end of the knife in the feed foot.

5. In a rib-applying machine, a foot having a flat workengaging face forpressing an adhesive tape progressively upon an insole and a side facedisposed at approximately right angles thereto, the foot having asemicircular passage leading at one end to the work-engaging face andopening transversely through the side face of the foot, an adjustingscrew in the foot tangentially disposed with respect to the passage, acylindrical knife in the passage having a straight cutting edge disposedapproximately parallel to its axis of curvature, and a clamping screwthreaded into the side face of the foot adjacent to the semicircularpassage for holding the knife fixed in adjusted position.

References Cited in the file of this patent UNITED STATES PATENTS887,957 Mclsaac May 19, 1908 1,238,268 Coey Aug. 28, 1917 1,252,348Johnson Jan. 1, 1918 2,142,332 Ridderstrom Jan. 3, 1939 2,216,153Bertrand Oct. 1, 1940 2,313,063 Haas Mar. 9, 1943 2,326,119 BertrandAug. 10, 1943 2,343,501 Ferrara Mar. 7, 1944 2,348,327 Calleo May 9,1944 2,417,516 Newhall Mar. 18, 1947

